title: Influence of Li+ codoping on visible emission of Y2O3:Tb3+, Yb3+ phosphor.
abstract: Upon 980 nm diode laser excitation visible upconversion emission from the Tb(3+) ions has been observed in combustion synthesized Tb(3+)-Yb(3+) codoped Y2O3 phosphor. The intensity of upconversion as well as downconversion emission bands has been increased by codoping of Li(+) ions into Tb(3+)-Yb(3+):Y2O3 phosphor and the reason behind this increment is discussed. The pump power dependence of upconversion emission bands has shown two-photon absorption process. The cooperative energy transfer from Yb(3+) to Tb(3+) ions is supposed to be responsible for the upconversion emission from the Tb(3+) ions on near infrared excitation. The calculated colour coordinates indicate the purity of intense green emission from present phosphor which is suitable for various photonic applications.
authors.affiliation: Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, Jharkhand, India.
authors.forename: Anurag
authors.initials: A
authors.lastname: Pandey
authors.forename: Vineet Kumar
authors.initials: VK
authors.lastname: Rai
authors.forename: Kaushal
authors.initials: K
authors.lastname: Kumar
mesh_terms: D008094:Lithium / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D015019:Yttrium; D008094:Lithium; D015018:Ytterbium; C091417:yttria
keywords: CIE coordinates; Combustion synthesis; Cooperative transfer; Terbium; Upconversion phosphor